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Hello Mallard1,
As far cast the cost of the scoop knives on your flail mower metal thickness and whether they are heat treated is the major concern.
The scoop knife hangers loops (V hangers) are reuseable as they are held in place by the metal strap loops that are held by the metal rods on each row.
I would just purchase the number needed for the repair and then a few extra spares from the Ford dealer for now and do your mowing and then decide if you really want to change them. These scoop knives are not all that expensive to replace in the scheme of things but you can also clean the cutting edge a little using a narrow whet stone dipped in water while it is on the knife hanger if they are really bad.
If all your doing is the food plots I would not worry to much about the scoop knives simply because the time to change them is when they
have been really dinged by rocks or you ride up on an asphalt drive way ledge while the mower is running.
You can always invest in a wet well grinder from micromark and a grinder angle tool from wood craft and sharpen them during the winter and then the mower will be ready to mow in the summer.
Mallard1 if you do not mind me asking this, are they growing a lot of dryland rice and sorghum in your neck of the woods?